CO2单级和双级片冰机的性能模拟分析

Performance Simulation Analysis of CO2 Single-stage and Two-stage Flake Ice Drum

在欧洲和许多北方国家,当进入滑雪季节时,雪的储量往往并不充足。因此,越来越多的人倾向于使用制冰机来补充前一年储存的雪,使滑雪季节尽早开始。制冰机的制冰量为50~100 t/d,为了研究片冰机(FID)在不同环境温度下的热力学性能,本文在工程方程求解器中模拟了每天产能为50 t的片冰机系统。结果表明:单级系统的能耗比双级系统小;片冰机的总传热系数和结冰速率与冰层厚度有关,冰层厚度还影响了水与CO2之间的传热;COMSOL计算表明,当FID中制冷剂管道在200根以上时,增加其数量对冻结表面的温度分布影响不大;可以通过调整结构强度而非传热性能来优化厚度。

In many destinations in Europe and Northern countries,the snow is not available when the skiing season is coming.There is an increasing interest to install ice machines to supplement the stored snow from the previous year,giving possibility to start the skiing season as early as possible.The ice capacity of such machines is 50 to 100 tonnes per day.Flake ice systems with a production capacity of 50 tons per day is modelled in engineering equation solver to investigate the thermodynamic performance at different ambient temperatures.The flake ice model shows that single stage systems consumes less energy than two stage systems.The total heat transfer coefficient and ice growth rate for the flake ice drum are highly dependent on the ice thickness,and the ice thickness influences the heat transfer from water to CO2.COMSOL calculations reveal that increasing the number of refrigerant pipes in the flake ice drum above 200,do not affect the temperature distribution on the freezing surface too much.The thickness can be optimized regarding the structural strength,rather than the heat transfer.